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The article does not say that downloading it over your wi-fi connection will result in $2.58 in delivery fees. It says that the average delivery fee for the book was $2.58.

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Amazon apply the fee regardless of delivery method. Check out the link posted by kennethcwilbur elsewhere in this thread.

https://kdp.amazon.com/self-publishing/help?topicId=A29FL26O...

Amazon charge $0.15/MB and the book was approximately 18MB in size.

I don't particularly approve of their pricing, but to be fair the book could be downloaded many times over 3G in the future included in that initial delivery cost.

And that fee would be more reasonable if Amazon allowed authors to provide optimised versions of their book suitable for e-readers that don't have high resolution colour screens.

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